Method of rolling h-sectioned steel members and mill train for the same



J 1965 KANICHI KISHIKAWA 3,165,948

METHOD OF ROLLING H-SECTIONED STEEL MEMBERS AND MILL. TRAIN FOR THE SAME3 Sheets-Sheet 1 Filed July 24, 1961 FIG.

INVEN TOR.

Kanichi Kishikawa Jan. 19, 1965 KANlCHl KISHIKAWA 3,165,948

METHOD OF ROLLING H-SECTIONED STEEL MEMBERS AND MILL TRAIN FOR THE SAMEFiled July 24, 1961 3 Sheets-Sheet 2 FIG. 3

INVENTOR.

Kanichi Kishikawa BY Jall- 1965 KANICHI KISHIKAWA 5 3,165,948

METHOD OF ROLLING H-SECTIONED STEEL MEMBER AND MILL TRAIN FOR THE SAMEFiled July 24, 1961 5 Sheets-Sheet 5 FIG.5

INVENTOR.

Kam'chl' Kishikawa WM pm United States Patent 3 165,948 MET H61) 05'RQLLiNG H-SECTEUNED STEEL MEMBERS AND lvllLL TRAIN FUR THE SAME KaniehiKishiirawa, Tchata, Japan, assignor to Yawata iron it; Steel 12., Ltd,Tokyo, .i'apan Filed Iuiy 24, 1961, Ser. No. 126,191 Qlaims priority,application Japan, July 23, 1969, 35/323,579 1 Claim. (Cl. 8tl6s) Thisinvention relates to a method of rolling H-sectioned steel members and amill train for the same. More particularly it is to obtain H-sectionedsteel members economically and accurately by a special arrangement ofedgers and a universal rolling mill.

The prior art teaches methods of rolling H-sectioned steel memberswherein a two-high or three-high section steel rolling mill is used andwherein a universal rolling mill is employed. The method of rollingH-sectioned steel members by using a universal rolling mill comprisessteps wherein a steel ingot is bloomed and rolled, and is then formedinto a blank having high flanges (height' from the web to the tip of theflange) by means of a breakdown rolling mill. The blank is then roughlyrolled by means of a rolling mill consisting of a universal rolling milland an edging roll provided adjacent to the front or rear of it and isfinish-rolled by means of a finishing universal rolling mill to form thefinal product.

In the general section steel rolling system, that is, in the case ofusing a two-high or three-high section, steel rolling mill, the flangeof the blank is required to be about twice as wide as the product. 0nthe other hand, in the universal rolling method, the above mentioneddisadvantage is correctedby the effective area reducing action of theuniversal rolling mill but it is desired that the flange of the productbe substantially the same width as the blank for the ideal conditionduring rolling. That is to say, the flange of the blank may be narrowbecause it is easy to bloom and roughly roll the blank. However, in theconventional rolling system, this advantage has not been easilyobtained, because of the disadvantage that, if the flange of the blankis made narrow in the edging roll, the clearance between the upper orlower surface of the web and the roll body surface will necessarilybecome large during the rolling process. That is to say, if theclearance between the upper or lower surface of the web and the rollbody surface becomes large, the edging roll action for equalizing theflmges will be greatly impaired.

Therefore, the blank must be rolled so that the flanges may be wide.Thus, before the blank is provided by the breakdown rolling mill from aningot, it will be difficult to mold the blank and ea considerable numberof steps will be required for rolling. Further, in the rolling step insuch conventional method, it has often occurred that the tip of theflange is rounded and that the tips'of the flanges offthe product areirregular.

As a result of research such defects of the conventional method havebeen eliminated by the present invention.

An object of the present invention is to provide a meth- 0d ofmanufacturing t l-sectioned steel members wherein a blank whose flangeis substantially as wide as the flange of the product to be produced isused as a starting material and a horizontal edging roll is providedadjacent torthe front and rear of a universal rolling mill soas to. makeit unnecessary to manufacture steel ingots of large there are providedpasses with opposed horizontal edging rolls in which the depths from theroll body surface to the tip of theflange of the steel member aredilferentlor 3,155,948 Patented Jan. 19., 1965 are the same, said passesbeing adjacent to the front or rear of a' universal rolling mill. Thehorizontal edging rolls in the passes are so constructed as to beadjustable in the direction at right angles to the rolling line.

If passes in which the depths from the roll body surface to the tip ofthe flange of the steel material are different, are provided, the edgingrolls provided in the front and rear of the universal rolling mill inthe present invention will be able to better attain the object of theinvention.

The other objects of the present invention will become clear from thefollowing specification and claim, taken with the accompanying drawings,in which:

FIGURE 1 is a plan view of the arrangement of a universal H-sectionedsteel member rolling equipment ac cording to the present invention.

FIGURE 2 is a perspective view of a rolling mill consisting of thehorizontal edging roll arrangement according to the present invention.

FIGURE 3 is a series of sections through a rolling showing the relationamong the dimensions of a horizontal edging roll in the arrangementof-the present in-,

vention, a blank steel piece and an intermediate product.

FIGURE'4 is a series of sectional views through the passes showing therolling method according to the present invention.

FIGURE 5 is a diagrammatic comparison of the blank rolling methodsbetween a conventional rolling method and the present invention.

According to the present invention, as described above, when two passesof horizontal edging rollers are arranged adjacent to the front and rearof a universal rough rolling mill, the rolling action will be stabilizedand the rolling accuracy will be improved and, as .a larger effect, thewidth of the flange ofthe product and that of the flange of the blankwill be able to be made substantially equal to each other. Therefore,with the already installed blank rolling equipment, wide flangedH-sectioned'steel blanks can be easily rolled. Further, accordingly,steel ingots of large cross-sections will become unnecessary and thekinds of steel ingots needed for the starting blanks will be fewer thanheretofore. V

Further the material on the inlet side of the roughing universal rollingmill will be held accurately by the hOIi,

' zontal edging rolls and the rolling by the roughing or intermediateroughing universal rolling mill will be able to be accurately carriedout. Also, as the later half edging is carried out by the horizontaledging rolls on the outlet side, the clearance between the edging rollbody surface and the material will be able to be made small, the edgingaction will be carried out accurately and the difference of thedimensions of the product will be substantially nil.

Because the blank whose flange width is made sub-' stantially equal tothe flange width of the product can be rolled as described above, anH-sectioned steel member' The present invention shall be detailed in thefollowing 1 with reference to the drawings.

Shown in FIGURE 1 is;an embodiment of invention having a novelarrangement of edgers. In the method A, 1 is a blooming mill, 2 is abreakdown mill,

3is a universal rouging mill and 9 and 10 are horizontally positionededgers arranged to the front and rear of the. universal roughing mill 3.7 is a finishing universal mill. 'That is to say, in this mill train,the steel ingot is'bloomed andthe blank is formed bythe blooming mill rag the;

the present" breakdown mill 2 and the blank is reciprocally rolledseveral times by the front horizontal edger 9 and the roughing mill 3and by the roughing mill 3 and the rear horizontal edger 10. After theblank is thus roughly rolled, it is fed to the finishing roll 7 so as tobe made with a finished product. In the method B, a universal roughingmill 3 having two horizontally positioned edgers 9 and 19 in the frontand rear and an intermediate rough-.

ing universal mill having a horizontally positioned edger 4 in the rearare arranged. In the method C, a universal roughing mill havinghorizontally positioned edgers 9 and 10 in the front and rear and auniversal finishing mill 9 having horizontally positioned edgers 11 and12 in the front and rear are arranged in sequence. In the methods B andC, 1 is a blooming mill. In the methods D and E, a universal roughingmill 3 has, adjacent the front or rear, a horizontally positioned edger9 or 10 having parallel passes of different depths arranged to beproperly shifted laterally of the rolling path. 7 is a universalfinishing mill. 7

FIGURE 2 shows an arrangement of edging rolls having one of the featuresof the present invention. In the drawing the mill 3 comprises a set ofhorizontal rolls l3 and 14 rotating about horizontal axes in directionsreverse to each other and a set of vertical rolls 15 and 16 havingvertical axes intersecting at right angles with the axesof thehorizontal roll axes in the plane connecting said horizontal roll axes.The horizontal rolls are to be driven by a prime mover. The verticalrolls are to be driven by the reciprocating frictional motion of thesteel member reciprocated by the drive of the horizontal rolls. Theserolling mills are used chiefly in rolling H-sectioned steel members. Theuniversal rolling mill 3 serves to press and reduce the web and flangesof the H-sectioned steel member. The horizontal edgers 9 and 19 havinghorizontal edging rolls 19 and 20 and 21 and 22, respectively, rotatableabout horizontal axes are placed adjacent to the mill 3 so as to'serveto roll and edge the tips of the flanges of the H-sectioned steel memberin cooperation with the mill 3. That is to say, in FIGURE 2, adjacent tothe intermediate roughing universal roller 3 are set horizontal edgers 9and 19, 9 being on the blank inlet side or in the front of the mill 3and It) being on the finishing mill side or in the rear of the'mill 3.It is preferable that the roll depth of the horizontal edger 9 issmaller than that-of the horizontal edger 10 set in the rear of theuniversal mill. This point shall be explained. The roll of thehorizontal edger 9 is so made that the depth (49 in FIGURE 3) from theroll body surface to the flange tip is smaller by 2;to. 3 mm. than theheight from the upper surface of the blank web. to the flange tip. (Thiscorresponds to the pressed and reduced amount necessary for rolling thematerial.) Further, it is effective that the roll depth (54 in FIGURE 3)of the horizontal edger 10 from the roll body surface to the flange tipshould be smaller by 3 to 4 mm. than the height to the flange tip fromthe upper surface of the web ofthe ma terial coming out of theintermediate roughing universal roll after 'more than half the totalnumber of passages for rolling the blank by the intermediate roughinguniversal rolls 3, for example, after 7 to 9 passages if the totalnumber of passages by the intermediate'roughing universal mills is 11.(This corresponds to the rolled amount necessary for rolling thematerial.)

The blank will be surrounded by the horizontal edger 9, Will have theblank flange tip rolled and the dimensions of the flange partsaccurately corrected, will be fed to the intermediate roughing universalmill 3, will pass through the mill 3,-will then turn, will return to thehorizontal edger 9 andthen again tothe mill 3. Thus, the operation willbe repeated several times. Meanwhile, the horizontal edging roll 10 willonly guide the material but will perform no edging action. As thehorizontal edger Ill 7 will thus perform the guiding action as describedabove, it

the blank has passed through the universal roughing mill 3 more thanhalf the total number of passes, the edging operation will be moved tothe horizontal edger It). In the first round of the horizontal edgerit), the same action will take place as with the first round action ofthe horizontal edger 9. That is to say, in the first round of rollingpassage through the horizontal edger it), the blank flange tip will berolled and the dimension of the flange parts will be accuratelycorrected. In the final passage through the intermediate roughing mill,the horizontal edger 1% will guide the material accurately and will feedit into the finishing universal mill 7. Meanwhile, the edging rolls ofthe horizontal edger 9 will only guide the material but will perform noedging action. That is to say, the horizontal edger 9 will act as aguide and will serve for greatly improving the rolling operation.

FIGURE 3 shows the relation between the rolling passage through thehorizontal edger 9 and the size of rough section steel piece rolledthereby and that between the rolling passage through the horizontaledger 10 and the size of an intermediate product.

In FIGURE 3, Q shows the size of rough section steel piece at the firstround of rolling passage through the horizontal edger 9. Qm shows thatat the m-th round of rolling passage through the horizontal edger 9.Qm-l-l shows that at the first round of rolling passage through thehorizontal edger 1(3 and Q12 shows that at the n-th round of rollingpassage through the horizontal edger 10.

In Q 48 .is the clearance between the horizontal upper and lower rollsat the place of the flange part, correspondnig to the flange width, 47the clearance between them at the place of the web part, correspondingto the web thickness, 46 the web thickness of a final product and 42 theflange thickness. There exists the following equation:

In Qm, Stl shows the flange width at the mth round of rolling passagethrough the horizontal edger 9, 51 the web thickness and 52 theclearance between the roll body surface and the web surface. Thefollowing equation between the dimensions will be found.

FIGURE 3 shows that according to the present invention, the roll depthof the horizontal edger 9 can be made small, and thereby the flangewidth of a blank can be made smaller than that of any conventional one,as seen from the Equation 1. That the roll depth 49 of the horizontaledger 9 can be made small is due to the edging rolling being dividedinto the two stages, i.e. the horizontal edgers 9 and 10. As the webthickness 51 may be larger than that of a final product 46, the rolldepth 49 will become small, as seen from the Equation 2. It is alsoclear that the larger the clearance 52 or 53, the smaller the rolldepth.

. mediate product have been determined by the standard dimensions of afinal product in design. Therefore, the roll depth of an edger must belarge and thereby a blank of wide-flange is required. If the flangewidth of a blank.

is larger than the flange dimension of the same product, the thicknessofthe blank will-be thinner inthe design of the material. Therefore, theflanges of the blank will have to be rolled so as to have a thin longshape. This will prove a great disadvantage in rolling.

One of the objects of the present invention is to make even a blank of asmall flange width rollable precisely. In order to obtain a blank whoseflanges are thin and wide, a steel ingot of a cross-section larger thanfor obtaining a .blank whose flanges are thickand narrow will berequired .in rollingand edging and the number of rolling V passages willincrease. Further, the blank flange'will be so'high that the width ofthevertical roll of the universal mill will increase and the diameter ofthehorizontal roll fitting thereto will become larger. In the bloomingroll and roughing roll, too, larger roll diameters will be required.

According to the present invention, as in FIGURE 1, part C, two pairs ofhorizontal edgers, 9 and and 11 and 12, are arranged adjacent and infront of and to the rear of the universal rolling mills 3 and '7,respectively, so that, while satisfying the size of the clearancerequired in rolling, the depth of the horizontal edging roll may be madesmaller than when arranging one horizontal edger as before, and theblank flange width may be made smaller than ever.

In FIGURE 4 is shown an embodiment of the rolling process according tothe present invention. Horizontal edgers 9 and 10 are arranged in frontof and to the rear of the universal mill 3 and a finishing universalmill 7 is arranged at a point spaced from the universal mill '7.

The small digits attached to the numerals represent the progress of thepassage of the blank through the mills.

In 9 the roll body surface will come into contact with the material web.In 9 after several passages, a clearance 55 will be produced. Here theedging action will be transferred to the rear edger 10. In the firstpassage 10 the roll body surface will be in contact with the materialWeb. After several passages, a clearance 56 will be produced. Theclearances 55 and 56 are of such sizes that they will not interfere withthe edging action. As already described, the roll depth (49 in FIGURE 3)of the edger 9 can be made smaller than when one edger as before 7 is afinishing passage.

FIGURE 5 shows the rolling of the blank as compared with theconventional method.

In the arrangement of the rolling mills according to the presentinvention, since two horizontal edgers are provided so as to function astwo roughing and intermediate roughing rolling mills, the blank to befed to the universal rolling mill may be of a large cross-section.Therefore, the breakdown mill may be of an open pass type and severalpasses can be provided on one roll; As the conventional rolling mill isnothing but a function of one intermediate roughing mill, is isnecessary to feed a blank of a thinner cross-section in which pressingand reduction have progressed so far as to include the part normallyperformed by the roughing universal mill. It is so difiicult to roll thethinner part having the shape of a wider flange that a closed pass isrequired for edging. Thus, only one kind can be arranged in thebreakdown.

In FIGURE 5, 2 shows a conventional breakdown mill with only one closedpass (a) and 2' a breakdown mill according to the present invention withpasses of three kinds, ([1), (b) and (c).

According to the conventional method, a blank which passed a bloomingmill 1 in the direction as shown with an arrow, passes a pass (a) of abreakdown mill 2 several times (seven times as shown in the figure) andthen reaches a universal mill 3. The use of a closed pass makes itpossible to press a blank thinly but has the following disadvantages:Only one kind of pass can be used for the roll. As a closed passrequires a collar 57 which is not required for an open pass, the collardiameter becomes that much larger. When thecollar diameter is larger, alarger roll manufacturing capacity will be required, the structure ofthe rolling mill housing will become larger and the minimum diameter ofthe partner roll in the collar part will be smaller, reducing thestrength of the latter.

On the other hand, according to the present invention, a blank whichpassed a blooming mill 1 in the direction as shown with an arrow, passesselectively three passes (a), (b) and (0) several times (three t'nnes asshown in the figure) and then passes through a horizontal edger 9, auniversal mill 3 and a horizontal edger 10 and reaches to a finishingmill 7. As two edgers are provided in front of and to the rear of auniversal mill, it is not necessary to use a breakdown roll with aclosed pass. Though the reduction by rolling through an open pass issmaller than through a closed pass, this deficiency in reduction can becovered by two horizontal edgers in the latter stage and severaldrawbacks accompanied by the use of a closed pass in the conventionalbreakdown roll as above mentioned will be eliminated by the use of anopen pass. Thus, the arrangement of two horizontal edgers according tothe present invention can afford the benefit already in the stage ofpreparing a blank.

The embodiments of the rolling mill train according to the presentinvention have been explained in the above. However, the technical ideaof the present invention includes the below mentioned modification ofthe rolling mill train. For example, in the method A in FIGURE 1, thoughthe universal roughing mill provided with horizontal edging rolls in thefront and to the rear has been explained, two universal roughing millsmay be arranged in parallel and edging rolls may be arranged in thefront of and to the rear. Likewise, where there are provided twouniversal roughing mills arranged parallel to each other, a horizontaledging roll may be further provided between them and horizontal edgingrolls may be provided in front of and to the rear of said paralleluniversal roughing mills. 7

Further, in the above described modified rolling mill train, theshifting mechanism for shifting the horizontal edging rolls in methods Dand E of FIG. 1 may be applied to the horizontal edging rolls.

What I claim is:

A method of rolling H-sectioned steel members with a rolling mill train,said rolling mill train comprising a universal rolling mill, an anteriorhorizontal edging mill and a posterior horizontal edging mill,comprising the steps of (l) rolling said steel member between theuniversal mill and the anterior edging mill and passing the steel memberthrough said posterior edging mill, said universal and anterior millsoperating in synchronization for reducing and shaping the steel memberand said posterior edging mill only guiding the steel member during therolling operation, for at least one-half of the total rolling steps, and

(2) rolling said steel member between the universal mill and theposterior edging mill and passing the steel member through said anterioredging mill, said universal mill and posterior mills operating insynchronization for reducing and shaping the steel member and saidanterior edging mill only guiding the steel member during the rollingoperation, for the remainder of the rolling steps.

References Cited by the Examiner UNITED STATES PATENTS 1,025,078 4/ 12Vassen 66 1,812,246 6/31 Oberg 80-66 1,930,410: lO/33 Baugnee 8Q-35WILLIAM J. STEPHENSON, Primary Examiner.

CHARLES W. LANHAM, LEON PEAR, Examiners.

